The International Space Station (ISS) has a number of live camera feeds – some of these are available to watch live through the NASA website. According to NASA: Live video from the International Space Station includes internal views when the crew is on-duty and Earth views at other times. The video is accompanied by audio of conversations between the crew and Mission Control.
On 1st April 2021 the live stream from the space station appeared to capture a large, well illuminated, spherical shape that seems to appear and rise above the horizon before it dims and slowly vanishes from the view of the camera.
Although the shape seems to rise from the horizon, it is in fact the rotation of the Earth that causes the anomaly to appear. Some claim that the effect is the result of light refraction from a solar or lunar sunrise or sunset. However, just as many people believe that this lighting explanation is not realistic and therefore, we cannot rule out that the anomaly is an artefact of extra-terrestrial origin.
This is just another example of anomalies caught on cameras from the ISS that still need to be fully explained.